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Describing Matter
Reviewing MATTER
• Matter: anything that has mass and takes up space
– Mass – the amount of matter in a substance– Volume – the amount of space something
occupies
What is a Property?
Property: a characteristic of a substance that can be observed
Physical Properties Physical property: a property that can be observed without changing the identity of the substance.color
size
shape
melting point
boiling point
density
solubility
luster – shininessmalleability - the ability to be hammered into a thin sheet ductility - the ability to be stretched into a wiremagnetism
Chemical Properties
Chemical property - a characteristic of a substance that indicates whether it can undergo a certain chemical change.
Examples:
• flammability
• ability to rust
• reactivity with vinegar
Physical Changes
Physical Change – a change in size, shape, or state of matter
• Physical changes DO NOT change the identity of the substances in the material
• May be reversible
• May be used to separate mixtures
Example: evaporation
Chemical Changes• Chemical change – a change of one
substance in a material into a new substance.
Examples:•fireworks exploding•burning matches•metal rusting•eggs cooking or rotting
Some signs that indicate that a chemical change has taken place:
Chemical Changes
• Formation of gas - bubbles forming
• change in the smell of something – rotting eggs, burning wood, etc.
• rapid production of energy (light, heat, and/or sound) - exploding fireworks
Law of Conservation of Mass
Matter is neither created nor destroyed in a chemical change
The mass of all substances before a chemical change
is equal to
the mass of all the substances remaining after the change.